Electrically-heated seam-rubber.



E. N. CHANDLER. ELECTRIC/xm HEATH) sEAM RUBBER,

APPLICATION FILED MAY 3, 1917y Til?. L?.

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UNITED sTATEs PATENT oEEroE.

EDWIN CHANDLER, OF BRAINTREE, MASSACHUSETTS, ASSIGNOR TO BOSTON LAST COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

ELECTRICALLY-HEATED SEAM-RUBBER.

Original application fledctober 7, 1914, Serial No.

To all whom t may concern:

Be it known that I, EDWIN N CHANDLER, a citizen of the United States, and resident of Braintree, inthe county of Norfolk and State of Massachusetts, have invented an Improvement in ElectricallylIeated Seam- Rubber, of which the following description, inv connection with the accompanying drawings, is a specification, like letters on the drawings representing-like parts.

The' present invention. is an electrically heated seam rubbing machine for use in connection with boots and shoes and this application is a divisionof my prior application Ser. No. 865,471, filed October 7, 1914. In the manufacture of boots and shoes it is frequently necessary to subject the shoe upper and particularly the seams, at the vamp, quarters, foXings, and heel straps and other parts, to a rubbing or smoothing apparatus, and for this purpose a seam rubbing machine has been devised. Heretofore it has been impossible to apply heat to any of the parts of such a seam rubbing machine, as the injury to the leather, the construction of the apparatus and the necessary method of operating the same presented seemingly insurmountable difliculties. By my present invention I have overcome these dii'liculties and have also provided a novel and specially eflicient form 'of seam rubbing apparatus, as

. well as utilizing my novel method of an insulated handle for an electrically heated tool, as explained in my prior application, which handle not only conducts and holds the wires for an electrical heater, but also leads the same out of the way of the operator and facilitates my novel method of applying a heating unit to the seam rubbing portions of such a machine.

Referring to the drawings,

Figure 1 is a view in perspective of my electrically heated seam rubbing machine;

Fig. 2 is an enlarged cross section view through the handle and heat receiving portion of the tool and Fig. 3 is a cross sectional view showing my improved form of seam rubbing tool.

As shown in Fig. 1, the seam rubbing machine comprises a base 1, formed with its upper surface rounded or flanged in an ogee contour as shown at 2, which base fits into a socket 3 on a cross member 4, the latter eX- tending substantially at right angles to the Specification of Letters Patent.

865,471. Divided and this application filed May 3,

Serial No. 166,156.

base 1 and having a T or bar 5, which latter may be pivoted at 6 to a bench or other support. The bar 5 carries a bearing 7 having a recess in its upper part and cooperating with an upper bearing S held by a bracket 9 to the bar 5 by a bolt 10. The upper part of the lower bearing 7 and the lower part of the upper bearing S are recessed to receive a round, ball-like end 11 of the seam rubbing tool 12, thus providingaball and socket joint for the tool 12 and permitting its manipulation in all directions over the flange 2. This tool 12 is preferably of U-form as shown in Fig. 53, presenting the lower rounded apex portion 13 to the work and consequently with this rounded Lportion resting on the Iiange 2, as shown.

The triangular form of the tool 12 facilitates t-he recessing .of the end portion as indicated at 14, Fig. 2, to receive a heating unit 15, while the end is also formed with projecting lugs 1G and 17 to receive the correspondingly spread portions 18 and 19 ren spectiyely of the tubular bushing 20 in the handle 21, threaded bolts 22,22, uniting the spread portions 1S and 19 with their rcspectiye lugs. I prefer to add a non-heat conducting washer 23 through which the bolts 22 pass, as shown. The handle 21 may be of wood, rubber, fiber or other material and by my construction is thoroughly insulated from the heated seam rubbing tool 12. while said handle carries the electric wire 24 to the .heating unit 15, leading the same through the handle and out of the way of the operator. lVashers 25 and 26, as clearly shown in Fig. 2, are provided, preferably of heat insulating material, and a retaining nut 27 is threaded onto the outer end of the bushing 2O fitting within a recess 28 in the handle.

In the operation of the seam rubber the upper or other part to be operated upon is placed on the flange 2 while the seam rubbing tool 12 is raised or removed and the tool is then brought into position and manipulated to and fro over the seam or other part to be treated. The application of both heat and pressure serves to expedite this work very greatly, simplifying the operation of seam rubbing, saving time, doing much better work with less eort and fatigue on the part of the operator.

My invention is further described and defined in the form of claims as follows:

l. A machine for smoothing boot and shoe parts, having a substantially triangular form in cross section with a rounded angle uniting two sides, an electrical heating unit carried by said iron, and a handle insulated from said iron and carrying the supply wires to said unit, whereby the smoothing operation on leather over uneven contours is facilitated.

2. A machine for smoothing boot and shoe parts, having a seam rubbing tool of substantially triangular form in cross section with a rounded angle uniting two sides, said iron being formed hollow to receive a removable heating unit, and a handle removably secured to the iron and adapted to hold said heating unit and iron in assembled position.

3. A seam rubbing tool of the kind described, comprising a base member and a removable iron, a universal joint connection for the iron, said iron being formed with a recess to receive a detachable electric heating unit, a handle having tubular conducting means therein for the supply wires for said heating unit with one end of said tube secured to said handle, and the other end having flanges secured to the heating iron, and heat insulating means between the. iron and handle.

In testimonyv whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

EDWIN N. CHANDLER.

Witnesses:

JAMES R. HODDER, HAROLD J. CLARK.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner u! Patente, Washington, D. C. 

